How to safely sell BTC with Zelle

I Would like to sell BTC on Bisq but I just can’t afford to get scammed.
It seems like Zelle is the best option I can see for fiat/btc but I have some questions.

How common are chargeback scams with Zelle?

I know it’s safest to only sell to signed accounts but what other steps can I take to make sure I don’t get charged back with Zelle?

There are very little chargebacks with Zelle, they’re almost unexistent. As you point out, signed accounts are more secure.