Current installation assuming you will do "whole home pvr" is the following:
same dish 500 as it was before;
same dpp quad/twin (bell stopped supplying quads recently, only used junk twins in really bad shape now) as before;
dpp44 only if install includes some older models (9500 often misbehave when connected to dpp44);
9500 ie hopper duo one/two of them linked with duo hub (Dish Pro Hybrid Duo Hub);
7500 ie 4k joey (with the 4k disabled of course) connected to the aforementioned solo/duo hub.
possible the following: two 9500s - duo hub - splitter - pack of 7500s.
this setup has some disadvantages such as limit of tuners, only two tuners per 9500, therefore if you have two 9500 and 4 7500 then you can only watch 4 tvs at once, the remaining will be watching some prerecorded stuff or on demand. for some bizzare reason bell deceded to go with hopper duo instead of hopper 3, moreover the limit of two 9500s per account. having hard time to comprehend the logic, but i am afraid that is what bell offers so far.
7500 can watch a regular channel, on demand, recordings, but netflix not yet, the last one only available on 9500. hopefully will be rersolved soon as well as the other apps they mentioned year ago.
so there is no instruction for bell in particular available, however you can reffer to Dish's hopper-joey installation bulletin, in which you have to imagine dish 1000.2 as dish 500, dish pro hybrid western arc lnb as dish pro plus twin, hubs remain the same, tap not available since dish doesnt have analogue of super joey, so ignore that part, then dish's hopper duo is 9500 and 4k joey or any joey for that matter as 7500. any questions post to this forum.
oh and yeah the 7500 has same ruwido slim remote as 9500 and as fibe non bluetooth remote (not interchangable with fibe receivers of course)