I would say it is a conditioner, but not operating in the traditional sense. My assumption is it strips RF from the power using the materials of the housing. If this is the case and the wire inside does not pass through any devices, then there would be next to no limitation to ampacity delivery. It's possible it could be slightly enhanced.
If the instruction for the Apex monos or for Boulder or CH Precision were to plug each of the power cords into a dedicated 20A outlet, then using one 20 amps outlet to feed one Powerzone would be limiting current. The solution might be to get 2 Powerzone. If you can afford the amps, you can afford 2 Powerzone.