I'm also wondering can I plot on the 20 different PC's then when they are done plotting, add the drives to 1 actual machine I plan mining on, or is it the PC that you pot the drive on, you have to mine on?
I do that all the time, no problem. Just make sure to use the same ID for all the plots, and that the nonces don't overlap between plots.
I just run a script similar the the one below on any computer where the target drives exists:
@setlocal
@cd /d %~dp0
start "" /belownormal "C:\Xplotter_AVX2\XPlotter_avx2.exe" -id 2597790682173387743 -sn 10600000001 -n 0 -t 52 -path c:\Burst\plot106 -mem 16G
start "" /belownormal "C:\Xplotter_AVX2\XPlotter_avx2.exe" -id 2597790682173387743 -sn 10700000001 -n 0 -t 52 -path c:\Burst\plot107 -mem 16G
@pause
-id - your numeric account id
-sn - start nounce of the plot
-n - end nounce. Set it to 0 to fill the disk
-t - CPU treads to use
-path - target drive
-mem - amount of memory to use. Unlike -t, -mem is allocated to each plotter instance, so the sum of them must be less than your total system RAM
You would of course want to change the -id value to whatever your's is, and the -t thread count and memory to your hardware. I like to leave at least a couple of threads free for other stuff.