I'm with Gonk, as long as your cable runs are as you've set up with the cable company (i.e., you paid for 3 TV drops and that's how it's split). The amplifier in question could probably be split 3 ways and still see a benefit. There are no specs, so I'll assume that bi-directional means it has a 5-42MHz return path for digital cable/modem.

If you're running to more rooms than that, you'll need to look into a distribution amplifier built for the number of cable drops you have.