A:
The 191 speakers are designed to be mounted either in a wall or in a ceiling. They can be installed into a stud or dry wall with the included anchors. Please verify that there will be enough depth clearance if you are installing into a stud.
These speakers can serve as a center channel speaker in a 5.1 setup. If it's possible in this setup, replacing the 191 with a dedicated center channel speaker may increase the clarity of dialog from TV and movies.
The 191 speakers are not weather resistant. They are not designed to withstand moisture or the elements. Depending on the environment they are to be used in, a screened in porch may not be a suitable location for these speakers.
We hope this helps. Thanks!