I recently bought a 17.3" from Costco while it was on sale for $449 that should fit. I think the seat widths are around that size now, so the tray should be slightly smaller perhaps. It has a touch pad, a touch screen, and I got a Logitech wireless mouse for $15 from Best Buy that works fine with it. It was for my Mother In Law so I'm not using it but the whole family says it's working well for what they needed. It has 1Tb hard drive, 12Gb ram, AMD Ryzen 5 processor & Windows 11 installed.

It appears the sale is still on, but ends today. Delivery only took a few days, so here's a link:
HP 17.3" Laptop