Yes, both files in usr/keys.
As long as each receiver has its own cable going from the dish to receiver then all will be fine.
You can't split sat cables.
Obviously you need a live VM feed to your receiver as well.
All my receivers have their own cable from the lnb of the dish, VM cable has been split three ways- 1 cable each to 2 E2 combo's boxes and 1 cable to vm router, splitt using tratec ecoline 5-1000mhz 3-way splitter