Yes, I do. I have roses in huge pots, raised beds and in the ground. I’m in Florida, sandy or sandy soil and nematodes. Like Roseseek said - be aware that roses in pots/raised beds will sink over time and the soil compacts. Those in pots do need to be raised up/replanted with the soil freshened and partially changed out/added to no matter what. My raised beds are gigantic: 1 is a 16’ diameter circle made with stacked landscape block, another is a circle about 8’ diameter also stacked landscape block and bricks. The last ones are large triangles made by combining metal raised bed panels into a huge equilateral triangles (12’ to a side). The raised bed metal panels are 1’ high. I also put in two 3’ long rebar stakes per side, on the OUTSIDE of the long metal beds to prevent the soil/water from warping/bending the bed sides outward. I spray paint the rebar stakes to match the color of the bed, and drive them down 2’, leaving the top of the stake flush with the top of the metal bed wall.
Depth: I believe it depends on rootstock some. In general, deeper is better than wider. I would advise - turning and amending the soil UNDER the raised bed before laying in the raised bed and filling it with your soil mix. Perhaps dig down about a foot+the raised foot of the bed=approx. 24” of soil. That said, I do NOT do this - as I don’t want to stir up nematodes in my case and our soil is mostly sand, not hard packed clay. We have great drainage.
Drying Out? The bigger beds, not as much. I do find that the triangle corners can be a bit dryer. Most of the time, the soil mix in my raised beds holds moisture better than my soil - I have to be careful not to OVER water. Pots or small (2’ x 2’) beds - yes, I’d watch those carefully. Get a soil moisture probe that will stick into the ground better than 8”. Test all the time, every time. The top might be dry, but the root zone can still be wet.
Soil mix: There are lots of ‘soil mix’ recipes for roses out there. Easy to Google. Roses are heavy feeders, so they need lots of nutrients. If you can build the soil so that there is a good mix of drainage, organic matter, etc. Great. Watch the pH level. If you’re watering with ‘city’ water - that pH level is likely too high for roses to really do well. Might need to add some acidifiers to the soil to help. Mulch with pine straw/needles will also help. You can find out the general water pH from your water company.
Another tip: Ideally you want your roses to last a good long time. Most wood or even coated metal panel raised beds will not last as long as your roses. (hopefully!) Make a plan for future wall replacement, or situate your beds where you can remove the old bed walls and just let the soil mound up - adding new soil to the edges/margins to create that slope. In my case, I cannot do that, so I will have to build a new wall next to the first, then remove the old panels and fit the new ones in and connect. Not sure if that will work yet or not… ask me 10 years or so, lol.
Question: why not dig your in-ground rose holes at least 2’ x 2’ big or more. Then mix, amend the clay soil you have and put it back into the hole? The soil will mound up since you added some soil, and your new rose bush would be planted therefore - a few inches above the main grade of your land. That elevation would help with drainage, right? (sorry for the long reply!)