There's nothing wrong with putting the pump and filter directly on the pad. You may find, though, that you need to put a 'patio block' (~ 8" * 1' * 1") to get the pump's intake to match up with the existing plumbing. The only reason to bolt a pump down is to reduce the noise caused by vibration when the pad isn't level - but a wooden shim will also fix this.

Putting unions on both the intake and effluent side of the pump will allow you to bring it in for the winter - and put one on the return line so you can bring in the filter and multiport.

If you need a little more on what I've said - simply ask and I'll provide more detail - Have a great summer with your pool and the new pump and filter!