The switch has four outputs so I will run 3-3100's and the run another line from the switch to a seperator.....that will give me the dual turner for my 9242..is that right now LOL ?
That is correct, you will need one seperator for the 9242. The seperator will then give you the split you need for the two tuners at the 9242.
Also, remember that the DPP44 switch can be cascaded so if you ever need more feeds at a later time you can just add another one. Just to keep in mind before you decide where you mount your first DPP44 switch.