Advice needed on connecting coax cables

Greeting all.

I would like your advice on this. I've just moved to a house with coax cabling but no ethernet anywhere.

So I have already ordered 2 pcs WF-803M devices waiting for the arrival here in Denmark in a few days.

The coax connection from the street (the cable provider) terminates in the garage from where 3 coax "strings" runs around the house. This is an old style cabling where several TV wall plugs are kinda daisy chained on the same string - not placed in a star topology.

Since I do not use the TV signal at all from the cable provider, I wanted to connect the 3 strings in the garage to form a single coax "backbone" so I can connect MoCA adapters on any TV wall plugs (effectively turning them into ethernet LAN) and have them all see each other.

My question is: How do I best connect these three coax strings in the Garage? Is it as simple as connecting them to the "out"-ports of a 3-way splitter, leaving the "in"-port empty?

Any comments or advice is highly appreciated.

Thanks in advance,

Henrik