Genie can provide full HD DVR functionality and DIRECTV programming to up to eight connected TVs. However, only four TVs—including the TV connected directly to Genie—can show live or recorded content at the same time.
If you expect to have more than four TVs in use at the same time, we recommend using HD DVRs for those extra TVs to ensure the best entertainment experience.
without calling DirecTV you would have to "replace" one of the wired minis. if you add a fourth client license on your account, then you can have all 4 but as the ohter have said, onle 3 can be on at the same time