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I use a lap desk similar to this:
QIELIZI Lap Laptop Desk - Portable Lap Desk with Pillow Cushion, Fits up to 15.6 inch Laptop for Home Office Students Use as Computer Laptop Stand, Book Tablet(1-Colorful Flower) https://www.amazon.com/dp/B08DNYFJ6L/ref=cm_sw_r_cp_api_glt_fabc_JZQ0J3RKNE8T4Z7YS5JR?_encoding=UTF8&psc=1
Discreet and secure
I have one similar to this. Amazon “lap desk” -this one is about $24.lap desk on Amazon