Can the S15 really be wall mounted?

Folks - I'm a little concerned about finding a thread which shows the S15 have a design flaw with wall mounting - https://forum.polkaudio.com/discussion/177041/keep-these-s15-speaker-mounts

It also turns out my S15 also have cracks since I mounted them in a different apartment before and now re-mounting in my new apartment. Should I just avoid wall mounting and buy low profile brackets - can somebody recommend something that's cost effective for 4 speakers?

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