With a SLNB in place, you do not need to run a separate HB cable anymore, all can be done via the LNB cabling provided all decoders are connected to the same SLNB and antenna.
I assume you are replacing the HD PVR 4 tuner decoder? It cannot be combined under one subscription with the others.
Then, there is no longer a reason to share any userbands, so rather set up the decoders to all use their own userbands.
Explora 1 will require a diplexer.
The others do not.
Explora 1: Userbands 0,1,2
Explora 2A: Userbands 3,4,5
Explora 2A: Userbands 6,7,8
Easyview, UEC 4T HD PVR, SD PVR, XV
Spare decoders: SD PVR(2), PACE HD PVR 4T, DSD 660, 1110, 1131, Explora
2 unmentionable FTA decoders
Win 10 Pro (64-bit) build 1607, version 14393.351
1.2m antenna, 8-way universal LNB, 2x6 MS, FSM permanently connected.