Will Mikrotik work on 2.4 and 5 Ghz at the same time?

Question

WiFi

Goodnight.
Is it possible to take the RB912UAG-5HPnD and the R11E-2HPND (or R11E-2HND) module to get a system that supports two frequencies at the same time?
And which module is better to take R11E-2PHND (1000mW) or R11E-2HND (800mW), and what then with power supply via poe, will the standard POE 24V 0.8mA unit be enough for a distance of about 70M.
Will two antennas be enough, one in mikrotik, one in the R11E module.
And lastly, will mikrotik capsman understand such a system?
I contacted the dealer in Belarus, they confirmed that there will be simultaneous support for two frequencies, R11E-2PHND (1000mW) will pull on power, but you need to buy two additional 2dBi antennas, there really will need to move the main antennas a little.
In terms of speed, it is critical for us, because there will be a lot of subscribers, the building of the main building of the university is ~ 250 meters long and 40 meters wide, plus load-bearing walls of almost a meter, and partitions between offices and auditoriums, and administrative buildings nearby, not counting three remote buildings, and therefore I want to get by with less equipment, for ease of management.
If the money for the project is confirmed and everything is promptly purchased, then I will write down what happened at the end.
Thanks everyone.

Answer 1

There shouldn't be any problems. If there is a place for the module!) Although the performance of this is in question.

Answer 2

And what does hap ac not like? He can do 2.4 and 5 at the same time. I set up capsman for 15 of these.

Answer 3

250 meters long and 40 wide, plus load-bearing walls almost a meter each

I do not quite understand, you want to cover it with one dot? Don't you think it won't fly?
I would still look in the direction of hAP ac, there are both poe in and poe out, you can assemble a garland, which can greatly simplify deployment.
Better yet, look towards the ubikutei.