Hi Stan.
Placement is going to be dependant on each individual room. All rooms are different.
But some good rules of thumb....
1) 18" to 24" off the backwall
2) The C809 .....8 ft. to 9ft. apart. Play around with their distance and see what suits the room and your ears best. It's possible 7 ft. to 8 ft. may work best in your room.
3) If possible, each speaker two and a half to three feet from the sidewalls.
4) The front baffle of each speaker should be further out than any piece of furniture that maybe between them; to avoid immediate reflections off the furniture. No furniture pieces should stick out further than the front bafle of your speakers.
5) Depending on your seating location and room size; try no toe-in (and listen for a while), then try just a slight toe-in (and listen for a while), then try more toe-in at tiny increments and listen for a little while, every time you move them.
And here's another little experiment I did.
I bought a bunch of these .......self-adhesive Waxman Grippers.....
http://www.lowes.com/lowes/lkn?action=productDetail&productId=54359-255-4739495N&lpage=none
I cut them into one or two inch pieces, peeled the protective paper off the adhesive side and carefully placed the adhesive side together; to make a thicker pad.
Then I placed one each under the front spikes (Front spikes only or front of floorstanders only) of my floorstanders (you can use a penny or dime under the spike and on top of the little gripper pad; to prevent puncture). Or if you have those brass spike coasters, depending on the thickness; you want to use just one gripper pad. As opposed to sticking two together.
I found that by lifting the front of my Jamo speakers just a 1/4 inch or a little over a 1/4" ........the soundstage became even bigger than it already was. Wider and more enveloping.
The bass response also seemed more powerful.
But, lifting the front up to a 1/2" or more.........compressed the bass down and made it seem like the bass was be squeezed out of a little vent; while expanding the midrange even larger. Didn't like that.
Different speakers, diffferent rooms ...may offer different results. But you'll immediately notice some differences.
Whether you perceive the changes as improvements; is an individual preference as well reliant of your room and speakers.
I also found that by using these.....
http://www.lowes.com/lowes/lkn?action=productDetail&productId=54433-255-4750095N&lpage=none
.....under all four corners of bookshelf speakers that may reside on some shelf, cabinet or speaker stands; it really smoothed out the sound and cut down on the effects of footfalls or vibrations coming from the floor and furniture.
Again, I peeled the protective paper off the adhesive side and carefully placed the adhesive sides together; to make one thicker pad. I used whole pads (stuck together) on my bigger Jamo C803 bookshelf speakers. And cut them down a little for a pair of smaller bookshelf speakers I have.
Basically, I made four thick pads (one neatly placed under each of the four corners on my speakers).
It made a very nice improvement in all cases.
Other's may find that heavier bookshelf speakers require a three stack of these stuck together grippers. Speakers weighing less, maybe only one pad thickness will be required.
I also use these under DVD Players, a Turntable, CD Players and Pre Amps. They work well. And it's a relatively inexpensive tweek to try.
Inexpensive and easy.