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I would say that either XPS 13 or XPS 15 if you don't mind the basic dedicated video card on the 15. The Lenovo Yoga seems good too.
I had a surgery around 3 years ago and I was mostly on the bed too. I bought something like this and it was really good: https://www.amazon.com/Adjustable-Aluminum-Notebook-Computer-Ergonomic/dp/B0793N7T25/ref=pd_sbs_121_3?_encoding=UTF8&pd_rd_i=B0793N7T25&pd_rd_r=1522HQ73XY26APTFZKN3&pd_rd_w=iznbI&pd_rd_wg=HlDgu&psc=1&refRID=1522HQ73XY26APTF...
Almost all of these types of trays are the same, I would recommend you to get one of the ones that have numbers on the joints and fans for the laptop.
it allowed me to keep working from bed.
I used to have a very heavy lenovo laptop and it would support them just fine.
check out suggestalaptop's quick picks: https://www.reddit.com/r/laptops/wiki/index
I'm personally waiting for the Gigabyte 15x refresh but that's above your budget.