I have experience with Mangrove Jack's M20 and M29 in high temperature. Last summer, I used them to brew a weizen and saison beer, at temperatures between 25° and 30° C. No off-flavors, although that might also be because the beers I brewed with them were not that big, OG of around 1.040.
You could brew other beers than weizen with the M20. Despite it being a weizen yeast, it has a relatively good flocculation. I brewed a Leffe clone with it. Don't use it for anything hoppy (except bitterness), hop taste and aroma definitely get muted.
The M29 is a var. diastaticus yeast. If you want more body, you will have to use more caramel/crystal malts. Mash at 62°, 66° or 69° C, it will all get eaten by this beast.
However, it is a very versatile yeast, which allows you to brew saison style, triple style and more or less hoppy styles. I brewed a single hop saison, with Merkur hops, which tasted terrific.
That is my experience with some high temperature resilient yeasts.