Quick note ...
When you fertilize a miniature rose, especially if it is in a smaller container, use no more than half strength fertilizer.
My practice when I had to grow all of my roses in containers while living in San Diego was to water the plant thoroughly the day before I fed them. By that I mean that all of the soil was well saturated.
Then when I fed the roses, I fed them lightly and often.
With all container grown roses, you want to make sure that they have excellent drainage. That means that you do not use a saucer under the container to catch water run-off. If the pot is sitting directly on hard surface, you want to lift the pot so that water drains out easily. There is no need to purchase expensive "pot feet" for your containers. You can use anything that will create a space between the bottom of the pot and the surface it is sitting on.
If you want to protect the hard surface, you can use a saucer, but make sure that there is a space between the pot and the saucer so that water can drain into the saucer and not be wicked back up into the container.
Good luck with your roses ...