I have a P10 milled for an RMR and a 75 milled for a Venom. The slides on the 07/10's are wide and work well with the RMR. On the 10, I had it milled for a buis in front of the RMR and have been very pleased with it. The Holosun uses the same mounting pattern as the RMR, so you have another option there. Not sure about the ACRO, but it sure looks...big.
My 75 was done just for match use, so buis were unnecessary. It all comes down to preference and purpose. One thing is for sure though, you can't go wrong with Primary Machine - great work and fast turn around.