The cheaper sunshades are mainly mesh and they stay up when installed, takes effort/time to remove.

I have a motorized shade that I can close or open at will, even when driving. However, its pricey.
IMO, I now have a giant powered moonroof.
It replaced 2 other shades, one is a mesh and the other is a roll out from the middle to front and back. The brackets for that one was poor.

Similar model...

Tesla Model Y Electric Powered Sunshade Retractable Glass Roof Sunshade | Hansshow

Upgrade your Model 3/Y with Hansshow's retractable glass roof roller sunshade. Our high-quality fabric sunshade protects you and your passengers from harmful UV rays and reduces heat buildup inside your ride. Experience the ultimate driving comfort today with Hansshow's retractable glass roof...

www.hautopart.com

 

My first question to you is why do you think you need a roof sunshade ?
The only sunshade I bought is this windshield sunshade that I used in both my Tesla Model 3 and my Model Y. It fits both and it is perfect for when you keep the car parked in the sun. When you are ready to drive, just start the preconditioning of the cabin 5 minutes before you are ready.
From my experience with both Model 3 and Model Y, if I keep the HVAC in Auto I don't need the sunshade above the head when driving long periods of time in hot days. And the Model Y has a heat protection on the roof.

My advice for you : drive it enough to get an idea of what is the reality (stop listening for those who want to sell you unicorns) and then make a decision. In my usage case, a roof sunshield on both Model 3 and Y isn't worth a dime.

 

A sunshade will also prevent you from getting a hot head.