DMS and IPTV are the only types supported in MC on non-Windows.
I actually misspoke. On non-Windows OpenCABLE and Sat>IP devices are also supported in MC29. The former is a US cable TV standard, that streams cable TV channels on local network using RTSP protocol. Sat>IP is a device that streams DVB (T, C, S, so it is not necessarily just Satellite) on local network, also using RTSP protocol. If you have one of these devices you can select "Digital cable or satellite" for Service Type during setup.
Unfortunately neither of these applies to "hdhomerun HDHR3-DT".
I am posting this just to set the record straight.