Tvheadend

Hi all,

TVH Version: 4.2.4-dmo1~bpo9+1~rpt1
OS Version : Raspbian Stretch Lite
From where : Not compiled myself, apt get install (from what I remember)
Tuner : Sony CXD2880 (on both Pi)
Problem : As follows

I have TVH set up on a Pi 3B using a TV hat as the tuner and after some fiddling that's working very well.

I had planned to have another Pi, also with a TV hat, set up and have a kind of master/slave arrangement.

Both servers would be set up to use the same aerial via a splitter and be seeing the same muxes, channels, etc.

The idea would be that the front end (OSMC on yet another Pi) would talk to the master, which would work out where the recording or live stream was going to come from.

I thought when I looked at options for backend and settled on TVH I saw a way to do this, but for the life of me cannot find it now.

I think I can do it via SAT>IP but I'm struggling to find much in the way of information on how to set it up and/or if it will actually do what I'm trying to achieve.

So, my questions are:

1. Is this the right way to do it or am I better off with a beefier Pi (3B+) and multiple tuners attached?
2. If the answer to 1 is either 'yes' or 'no reason not to', do I use SAT>IP?
3. If the answer to 2 is yes, could someone point me towards a guide/comment that would help?
4. If not, how can I achieve it please?

Thanks in advance, and apologies if this is out there and obvious and I've just been dense and missed it!