If you absolutely have to use drywall anchors, and I'm not sure if you should in this case, but you need something that will hold up, you want Toggler Snaptoggle anchors. https://www.amazon.com/TOGGLER-SNAPTOGGLE-Drywall-Included-Fastener/dp/B07FMCHQ8W/

They have different sizes, and when Project Farm tested them they performed like no others. I've used them for a few things and they are great. They're expensive compared to the alternatives, but it's not like you need hundreds of them so the cost is irrelevant.