In perusing
the datasheet, it looks like these use about 2 amps each.
Inrush current is much more, but lasts a half-cycle [no time at all] and won't be an issue with your amount of fixtures so lets not get in to the weeds on that. Anyway, looks like you'll be pulling about ten amps max so as long as the
circuit you're using isn't also supplying a
fog machine, refrigeration
unit, coffee maker,
etc, you should be fine. The circuits in your school (even the wall outlets) are going to be good for 20 amps minimum. But yes, CS relays definitely won't like being on dimmers. I know
ETC okay's it with their fixtures (on their dimmers), but I doubt they recommend it for relays and other electronics.
You should be able to put 4 575w fixtures on a single 2.4kw
dimmer circuit. Any more than that and you're heading for an overload. Some battens have repeating circuits (the bane of my existence) which may look something like "10, 11, 12, 13, 10, 11, 12, 13". In this case, all like numbers almost certainly share a
dimmer so you have to take that in to account when calculating the total load. It's easy to get carried away with two-fers and inadvertently pull more
power than you should.