That sounds like a really nice patio area! I think the Ambisonic speakers will do a really good job to cover that big of a space. Hopefully there's a dealer near you so they can come out to take a closer look and make their recommendation.
Looking for recommendations for outdoor speakers
These would be WIRED, mounted to poles, and up relatively high.
The purpose is casual listening (not critical listening) when drinking cocktails and people talking, but which are not overtly offensive to someone who normally listens in a dedicated audio room. Primarily rock and roll and the like.
The choices for outdoor speakers that are not G-d Awful seems pretty slim or I am looking in the wrong places.
I am strongly leaning to the Bowers Architectural Monitor outdoor speakers (mounting them tweeter down) with a JBL AWC15LF-BK sub mounted above them. (Subs being necessary because the Bowers are bass restricted.)
Also in the running are KEF Venturas, again paired with the JBL subs.
Note, JBL is picked because I literally cannot find any other outdoor/pole mounted subs.
Floor standing subs are not an option.