In wall center channel with tower speakers for home theater

Hello! I'm a novice trying to put together a home theater system.

Current plan is to have tower speakers (DefTech?) for front left and right. In-wall center channel and 2 rear speakers in-ceiling.

Open to all advice. Thanks!

With room correction this might work...take a look at the frequency response of the in-wall and the towers. Look for them to be equally smooth. 

Actually I take that back. the In walls are the part that can fail spectacularly.  My advice is to go without a center at first, and add if desired. 
It’s absolutely crucial that the center matches the fronts. Stay with the same brand and spends a much as possible on the center. In HT, that speakers does the vast majority on the work, not a place to save money.