Because the screen on the 2020 SE is curved, only screen protectors that are curved will fit properly. The screens on the iPhone 7/8 are
flat and the screen protectors that fit them properly are
flat. Protectors that fit iPhones 7/8 will always produce the halo effect on the 2020 SE. You can't buy a protector that fits
both the 2020 SE
and the iPhones 7/8. Only a protector that is specifically designed to fit the curved 2020 SE screen will provide coverage without the halo effect. I have had conversations with Apple and Belkin about the issue, but neither seems especially eager to address it. Bottom line: The
Belkin Invisiglass protector advertised on the Apple web site as compatible with the 2020 SE will not work on that phone without creating the halo effect.