In the past I've always terminated both cables with F-Type male plugs and used a female-to-female coupler to join the two. Is there a better way, noting that this join will be under the floor and not readily accessible?

I note that CPC sell a single device (https://cpc.farnell.com/pro-signal/p...ler/dp/AR70664) that contains a screw clamp to make the join. Any issue with using one of these? It appears there's no shielding - does that matter?