Would be curious what your solution will be?
My solution has been to have only the two tuner Tablo and not overtax it. I never trusted the 4 tuner version because I didn’t believe the box can support 4 tuners in reality. We never record more than one show at a time. We never view shows being recorded. If we need to record a second show in parallel we have a Homeworx DVR. If we need to watch a show live while recording, we watch it directly through the TV’s tuner.
I simply don’t trust DVRs period. We had problems with Tivos and DirecTV DVRs years ago and had all sorts of monthly insurance policies for them. The philosophy since then has been, “Use a DVR as sparingly as possible.” Thus far it has worked.
Also I have created another DVR using a spare Kodi box using LibreELEC and TVheadend. That works well in addition to the Homeworx to supplement the Tablo. Whenever we have a “must record” show, we use two different DVRs so that if one fails, the other usually succeeds (two different makes of DVR).
All this so I don’t have to depend solely on the Tablo and use it just a few hours a day. Not ideal but I learned my lesson of relying on one box and using one too much.