One dedicated circuit for each mono block?

+1 mesch

So maybe a dedicated circuit can be used to plug amps directly into and then have Power isolator connected to a separate Circuit for everything else.

Yes. One dedicated 20A circuit for the two amps and one dedicated 20A circuit for your front end stuff. Amps plugged directly into the wall. No comment on whether to use the power isolator for your front end gear.
I have owned some pretty big monoblock amps (both Class A and AB) but none where a single 20A circuit would not have provided enough power, although I suspect there are a few monster amps out there. @erik_squires asked a good question as to the power consumption of your amps, and an easy way to gauge would be to look at the fuse size to each. If 8A or below, then one circuit at 20A should be enough.

I have found separating the digital and analog front end gear beneficial. I have four dedicated lines, one for each monoblock amp, one for analog and one for digital. All four dedicated lines use steel case MC cable. I prefer the MC with metal boxes for better shielding. I would run at least two dedicated lines depending on your power requirements. FWIW, I plug all my gear directly into the dedicated lines.   😎 See references below:

Mike

See power Conditioning page #38:

I have yet to install a dedicated line, but I recognize the need. I have two 800 watt class D subamplifiers, 300 watt per channel integrated and all the usual bits plugged into one 15 amp plug. McIntosh, in their instructions specify that the integrated is to be plugged directly into the wall. All are plugged into the six separate circuits of the Everest 8000. Shunyata claims that each circuit can provide a momentary 30 Amps. Everything about the musical presentation is improved when plugged into the Everest and using Shunyata’s NR power cables. So, I will dedicate one 20 Amp circuit, but other than my TT motor, all goes through the conditioner.

@jumia   I have my stereo sysem plugged into one dedicated line.  

So anything that might have noise associated with it such as a wall wart gets plugged into the other line.  So no, it doesn't affect my system any more than something plugged in at the other end of the house.