At least some of your ukuleles are solid topped.
And one of the Kalas is 100% solid mahogany.
Get cases for those for sure.
For wall hangers we like these;
https://www.amazon.com/dp/B00ZU86PE...t=&hvlocphy=9032044&hvtargid=pla-383512147800
We live near close enough to the coast to have great humidity, unless the Santa Anas are blowing.
If you live in land, its different.