Too many variables to accurately answer that.Do you think 3 motors would be enough vacuum if the vacuum in the zones were evened out?
It depends on:
The size of the parts.
Size and type of tool.
Material.
Feedrate.
How much of the table is exposed (leakage).
There are a lot of posts on the Shopbot Forum about these vacuum motors.
Most people use 3 or 4 motors for a 4x8 table.
Since a 5x10 table is ~60% larger, you'd probably need 6 motors to get a similar amount of vacuum.
I think most get 240V motors, as you'd need double the amps to run them at 120V. You'd need 60 amps at 120V to run 4 of them.