The only traditional mesh node I found is a Netgear Orbi unit that works with their RBR50 mesh system:
https://www.amazon.com/dp/B07RN9PFNX/ref=cm_sw_r_cp_apa_glt_fabc_XC8VPJJ8SHN76RBYDHS4
Note that the Unifi APs you found will work fine for what you want to do and they are more likely to resist years of aggression from the elements. However, they work in a slightly different way and may be more involved to set up.
Amazon has the outdoor satellite right now and for the cheapest price I've seen in a while. However, I would agree with a previous response that a wired backhaul would be the best solution. Get some Cat7 ethernet cable and bury it. That's what I did for a 250' run from a friends lake home to the sauna and it works great. Just didn't want to bother with any wifi drops at that range. The satellite has been outside in an extreme northern climate with temps down to 30 below zero. I also ran cameras off the backhaul.
NETGEAR Orbi Outdoor satellite WiFi extender, works with any WiFi router, gateway, or ISP rented equipment (RBS50Y) https://www.amazon.com/dp/B07RN9PFNX/ref=cm_sw_r_em_apa_fabt1_W.iUFbDZZFCCG
Product name: NETGEAR Orbi Outdoor satellite WiFi extender, works with any WiFi router, gateway, or ISP rented equipment (RBS50Y)
Features:
Highest price ever: $359.25
Lowest price ever: $277.33
Average price: $336.87
Previous price: $349.99
Current price: $269.99
Last price change: -23%
Price change from average: -19%
Price change from all-time low: This is the lowest price ever!
The item was in stock as of 30/05/2021 18:00:27 (UTC)
NETGEAR Orbi Outdoor satellite WiFi extender, works with any WiFi router, gateway, or ISP rented equipment (RBS50Y) https://www.amazon.com/dp/B07RN9PFNX/ref=cm_sw_r_cp_api_glt_fabc_56J1HDK84GV80HVX1192