I have 3 Lenovo ThinkSmart View falshed with LineageOS. I've had them for about a year now and haven't had any issues.

Guide for flashing -> https://github.com/pgale/lineage_15.1_Installation_TSV

If you just want to put it on the wall: No tablet at all. A proper Touchscreen with DDC/CI for control of the display by the host (e.g. regulate it's brightness). And then use a raspi or similar as the actual player with a digital signage solution.

Why? It gives you far better and far more consistent support for basically everything. Want to include hardware keys? Go for it. Want to include an NFC reader? Go for it. Want to pair it with a presence detector? Go for it. (I do all of the above).

The good thing is: You don't have to. There are "ready made" distributions for digital signage available for the pi (just install them on usb instead of SDcard). I read an article a while ago that around 30% of all digital signage solutions these days are SBC based. You plug in the display. You are set. That's all you need to do at first. Everything else is "when you find time for it".

If money's not a factor? Maybe a Linux Panel PC.

I've tried a few Lenovos and they seem ok - inc. the Lenovo Thinksmart discussed on the HA forum

All tablets have a quirk somewhere, but FullyKiosk does a good job - if the tablet is any good - so I recommend it. A colleague used something else.. I'll try to find out what it was.

Whatever you do get, if it has a battery, ensure you monitor it's battery and keep it somewhere between ~20% & ~80% with a smart power socket / USB relay

Based on your statement that you've only had this for a few months, my suggestion is to assume you'll want to change it in 1~2 years, so try cheap, named brand, 2nd hand ones from ebay until you get size and rotation right for how you use it.

My dashboard on the kitchen tablet is landscape, but portrait in the lounge (on the ThinkSmart on a coffee table) - both seemed too big initially, now they feel too small.