Display tester for smartphone repairs

I opened a small shop in germany with me repairing smartphones.
I recently bulk ordered 100 displays for motorola g8 power i commonly repair and now i want to check if they are working or not.
There are several tester for iphone displays (Banggood Qianli etc.) but i cant find anything for any other brand of phones.
Are there any generic test devices or do i have to test them one by one with a phone?