Zerotier + HDHomeRun (DLNA)

[Machspeed]

Hello,

I'm trying to figure out how to approach DLNA streaming over internet from my local LAN (192.168.1.0/24)
The DLNA device has a static ip on the LAN.
I've setup the zerotier interface (OPT1) and my intention is to have some kind of bridge between the LAN DLNA ip and the OPT1 zerotier network, to make it appear as if the DLNA server is also on the zerotier network.
This works if I have a LAN Steam client connected to the zerotier network, meaning that I can stream Steam over the internet through the zerotier network.

I've tried following HOWTO - Routing Traffic over Private VPN https://forum.opnsense.org/index.php?topic=4979.0 up until Step 9 but I don't have a VPN_Gateway with zerotier (is it beacuse zerotier is a simple switch, not a router?) and without putting in the gateway it doesn't seem to work.

Now I'm trying to figure out if maybe I need a different approach? I've read about IGMP Proxy but don't know if it will work? Then I've heard about quagga routing, maybe that would work?

I've got a feeling that the answer is very close but can't figure it out.
Any hints?