Im in d process of activating (2) 312 receivers to 2 tvs i will be purchasing the 2 other tvs next weekend and will be using them with the 312 receivers. My question is if i call dish to acitvate these receivers can they activate them with just 2 tvs plugged in or do i hv to have the four when i acitvate them. Again i will b purchasing the other two tvs next weekend as they will b on sell. Hope this makes sense