Position

A Smoke Detector really should go on the ceiling. So I guess double-sided-tape would be your alternative.

Same goes for your Carbon Monoxide Detector, you asked about in the other section.

Thanks for this!

I see there is a tape on the shell of my two products. Can I use this or another more strong adhesive is needed? Thanks

The tape needs to be suited for the type of ceiling material/coating you have.
In general I would recommend a foam backed tape to compensate uneven surfaces for maximum adhesion.

Ask a service person in a local hardware store for advice.

Yes thank you. I already have a strong foam tape and probably I will install the detectors with it. I hope the one on the ceiling don’t fall. Thank you again!