Are these a better option than a m.2 to PCIE adapter? I've read mixed reviews regarding safety (melting boards etc.) and reliability.

I have an asus prime 270a. I just want something that is reliable and safe and i've struggled to establish find a consensus regarding which option is better. The thread may be biased, but if the m.2 to PCIE is a better option, can someone recommend me a link to a quality one?