My audio room has limited floor space. I found an incredible deal on some small tower speakers. Can I reasonable place tower speakers on AVR cabinet 24" off the floor? Currently I have bookshelf speakers there, which are too low without stands. Most of my listening is done standing, so the tweeters would actually be closer to my ears then if they were floor standing.
What Shady says is true...
But if you are just talking about putting them on a flat surface that isn't the floor, sure, you may be fine.
Depending on your usage, its always worth keeping in mind proper placement recommendations so you can get the best SQ from your setup.
Biggest concern is making certain the console, or whatever the furniture is, can handle the weight of the Speakers and isn't wobbly or easily transmits vibrations to the electronics within.