We just have the 1 Maxxair installed in the kitchen for now & IMO it's all you need to cool a 30' TT as long as you open some windows or other vents.
The nice thing about the Maxxair 7500 is that the fan & hood are all-in-one so you do not have to buy a separate hood. When researching, folks that had both said the Maxxair is louder than the Fantastic... For instance, running on high it was difficult to hear the TV right next to the fan... However, you can set it to any speed, set it to turn-off at a certain temp, use it in push or pull direction, and you can even close the vent & use it as a "ceiling fan" with the A/C running.
I was going to install (1) in master BR & (1) in bunk house but decided a fan over the kitchen would be better than in the master. Not only does it handle the heat produced by cooking but I can run it on a higher setting at night without hearing it directly overhead....
For the 2 I bought on Amazon, both remotes control both fans but they are line-of-sight so as long as the remotes are placed in strategic places they should not interfere with each other...
2011 RAM 2500 ST Crew Cab 5.7 Hemi
2011 Primetime 3150BHD Touring Edition
Days camped in 2016-36
Days camped in 2015-37
; Days camped in 2014-31