Stick this on the back of your tablet:

https://www.amazon.com/gp/product/B09MDX8TPB/ref=ppx\_yo\_dt\_b\_asin\_title\_o08\_s00?ie=UTF8&psc=1

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Here's the controller mount.

https://www.amazon.com/OtterBox-Mobile-MagSafe-Wireless-Controllers/dp/B09D8S4VN5/ref=sr_1_1?crid=3W4VA2H48D5N6&keywords=magsafe+controller+mount+otterbox&qid=1648680070&sprefix=magsafe+controller+mount+otterbox%2Caps%2C111&sr=8-1

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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:

https://www.amazon.com/s?k=powera+mount&crid=3AMR1LCYTV75S&sprefix=power+mount%2Caps%2C111&ref=nb\_sb\_noss\_1

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.