Just use a standard wall mount of your choice and bolt it to the Entegra assembly. Here are some photos of mine:
https://photos.app.goo.gl/acChJzSj6MgtxnVp8
You will need to futz with spacers and VESA bolt lengths which will vary with the TV.
We use some strong magnets to hold it closed during travel. Don't even need to attach them, just place between the arms and the backplate. Has been in use daily since 2016 and works great.
Strongly suggest checking the screws that hold the base of the Entegra mount, mine were just wallboard screws into a plywood panel underneath the solid surface and some were stripped. I replaced the back two screws with threaded bolts, nuts and fender washers. There will be considerably more stress on those screws when the TV is pulled out on the mount.
This is the mount I used but there are many choices:
https://a.co/d/7VIyyrj
It works fine for the factory TV as well as a newer 50" QLED we installed in 2020. I mounted the soundbar under the TV so it pulls out and swivels with the set. We are happy with this setup.