Mackie Thump are garbage -- they're rebranded Tapco and won't last.
Haven't heard or used the FBT series so can't comment.
Yep, the Yamaha Club series would be my reco. Truly the only budget speaker that actually sounds very good given its price.
Get them up in the air and add processing as inserts on your Yamaha mixers - at a minimum, Graphic EQ and comp/limiter, or a Driverack. Put it behind a perforated security cover so that the kids can't mess with the settings - something like this. Perforated Steel Security Covers - PSC
I'd also consider buying these speakers used to make your dollars go further. No sense buying new ones for a rental place. If you need to replace drivers, Parts Express has most of them or suitable replacements.