I am not aware that one can populate the "Scan To List" with multiple computers.
Should your Epson talk to a network router wirelessly, then other computers in system
can have scanned output transferred to their computer in any folder marked shared.
Epson scan software must be installed these computers.
Operator (for PC2 or PC3) simply clicks "Epson Scan" on his desktop
Select "Office Mode"
Click "Scan"
Select Location "Other"
Click "Browse"
Select "Network"
Select PC2 or PC3 etc
Select any folder (previously flagged Share) on PC2 or PC3 etc.
One must enable Network Discovery and File & Printer Sharing each computer.
Control Panel->Network & Sharing Center->Advanced Sharing Settings
To be clear, we are speaking of one scanning printer, which is remote to the other computers in system.
Im not sure this is what you desire??
Regards