I am looking at buying 2 tablets to mount in the van so that on long trips the kids can watch Netflix movies and such together (one table on each row of seats). So definitely want it to have good screen quality while mirroring.

Wanting it so that each tablet is showing the exact same thing at the same time so that all 5 kids are wanting the show at the same time and the sound is playing over radio via Bluetooth.

Sounds like if I get Galaxy tablets I can use Samsung Flow, but as I see people demoing it on Youtube, looks like the phone would get dim when showing videos, which would defeat the purpose. I would also be more limited to what Tablets I get.

I read ApowerMirror does good quality but I saw somewhere it is around $30/month.

Do I just need to find Tablets with HDMI inputs/Outputs?

Any recommendations?