Lowest latency triggering multiple Arduinos using NRF24L01+
Yes, that should work, however also think about the following issues:


What if one (or more) camera does not receive the signal? You might need to add an ACK signal, but of course this will reduce the latency (a lot). If you don't want an ACK signal
To prevent an ACK, you can send the signal many times (and cameras who already processed the signal not react for a fixed amount of time). Of course it will received by the other cameras (at least) 283 us later.
If reliability is important, you could try using a less high speed, the latency will go up, but reality too.


Also you probably can fire the cameras even faster, if you first send the address bytes (4 bytes). And than send the shoot signal which can be in principle 1 bit. You can use one of the bits for that in case 128 cameras would suffice. Or send one byte extra which contains the signal to shoot.