We use asymmetric rims made of T800 carbon with an external width 30 mm and an inner width 24 mm for the construction of wheels dedicated for gravel bikes 30 -- - 24 mm.
Hookless rims are dedicated for tubeless tires and can be pumped without any consequences to over 58 psi
Asymmetric rim is a laterally stiffer and more stable wheel, which, when riding off-road, often with various obstacles (stones, roots, holes, grooves, etc.) affects the riding comfort and, above all, safety.
If you are looking for solid and reliable wheels for gravel / cyclo-cross this is the best choice you can take.