[noggin]

Raspberry Pi 2s have very good 1080i and 576i/480i deinterlacing for the price and excellent support. Depending on your approach to integrating your HD Homerun into your system, you might want to run a main server box (like a Chromebox etc.) with a bit more IO throughput (GigE, USB 3 etc.) to handle recording and intermediate serving duties, rather than run the HDHRs straight into Kodi?

Thanks for the input!

Could you clarify? So are you saying the Pi's basically function as a TV client, but I also need a central "server" type box? Sounds like Plex server/client format. Not going with Plex as the Live TV app is a pain to make reliable.

Run the HDHR through the server first? Would I run Kodi on all three machines? Windows or Linux?

Most Live TV/PVR solutions for Kodi rely on the client server model - with a backend server (TV Headend, VDR, MythTV) doing the tuning and recording stuff, and streaming live TV to clients running in Kodi. It is entirely possible for the backend server to be running on the same box as a Kodi client though. This is because most tuner solutions rely on USB or PCI/PCI-E cards to handle reception duties.

The HD HomeRun is a bit different as it is a networked TV tuner. As such there are, I believe, clients for Kodi that will work directly with the HDHR tuner on your network, and don't need a server. However this may not be a great solution, as with a backend server you can remotely schedule recordings from within Kodi, but that are recorded if that client is switched off. You can clash resolve recording requests made by multiple clients, and you can also intelligently share tuners. In the UK for instance, BBC One and BBC Two are on the same frequency so only need one tuner to record/watch live both channels.

It is possible to integrate HD Homerun tuners into backend servers like TV Headend, and I'd suggest that might be your best course of action. The reason I suggested using a slightly better spec device than a Pi 2 as a server is that the Pi 2 is limited in IO bandwidth - so if it has to stream multiple channels, whilst making recordings, and accepting channels to record over the network, the 100Mbs Ethernet connection and the single USB 2.0 connection that the USB ports and Ethernet port share is a bottleneck potentially.