For a room that size, I suggest smaller speakers for rears and surrounds. I'll even go so far as suggesting that more than 5 channels is too much in a room such as yours.
I agree with the others who suggest you avoid Tekton speakers. They suffer from too much enthusiastic online hype, with little or no evidence to support those claims. There are plenty of other good speakers in your price range that have good reviews accompanied by believable measurements.
For rear or surround channels, NHT SuperZero 2.1 speakers are small enough to easily mount on walls. They're known for their neutral sound, will go well with a wide variety of front speakers, and you can't beat their price.
NHT (Now Hear This), Llc. is an American loudspeaker company based in Benicia, California that specializes in acoustic suspension loudspeakers and patented in-ceiling speakers
www.nhthifi.com
NHT makes two other models, the C1 and SuperOne. They are larger and cost more.
NHT (Now Hear This), Llc. is an American loudspeaker company based in Benicia, California that specializes in acoustic suspension loudspeakers and patented in-ceiling speakers
www.nhthifi.com