I have the spigen one too. It does make it a little too thick

I had an ultra-thin TPU case like this on my pixel

https://www.amazon.com/X-level-Mobile-Guardian-Finish-Protective/dp/B07TC85DRV/ref=sr_1_129?dchild=1&keywords=lg+g8+thinq+case+thin+tpu&qid=1586905871&sr=8-129

Screen cracked because there is not enough lip. I loved that case much more in my pocket though. And i did not have a screen protector on so it may work if you do that as well.