Sinjimoru Universal Magnet Sticker for All Smartphones & iPhone Series, Strong Magnetic Stickers Compatible with MagSafe Accessories and Qi Wireless Charger. M-Plate White https://www.amazon.com/dp/B09MDX8TPB/ref=cm_sw_r_apan_glt_i_S2A6BZQYR4YQ01ACMETC?_encoding=UTF8&psc=1
I have one of these on my Pixel 6 Pro https://smile.amazon.com/dp/B09MDX8TPB Sinjimoru Ring Magnetic Plate for MagSafe Stickers, Slim Magnetic Plate for MagSafe Charger & MagSafe Accessories for All Smartphones & iPhone 12/13 and 14 Series. M-Plate White
Works very well except that the adhesive not made for glass so I had to superglue it and the leakage looks slightly janky - function over form though and I use a magsafe popsocket 95% of the time anyway.
Stick this on the back of your tablet:
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Here's the controller mount.
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The magnet on the controller mount is a little on the weak side. If you are feeling industrious, try this:
https://www.amazon.com/gp/product/B08SQL789S/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Take that magnet and stick it on this:
It's a much stronger hold. It will support a Tab S7+. But you'll have to really work on the screen articulation to get it balanced to make it comfortable. I kinda angle the large tablet to rest on my forearms a bit while I play.
Sinjimoru Universal Magnet... https://www.amazon.com/dp/B09MDX8TPB?ref=ppx_pop_mob_ap_share
I got this sticker instead. Using other MagSafe accessories with it, mostly the MagSafe Pop Socket wallet. Works great
I got mine off Amazon. https://www.amazon.com/dp/B09MDX8TPB/
This is the one I bought and it works very well, but there are others you can buy. I just know this one was advertised to work with Samsung phones at least.