Unfortunately you might end up with drainage issues due to rain + rubber mats, but give it some time and see how things go.
Being realistic, you're probably going to need to expand that run - as it's barely large enough for 3 standard(?) birds, and a couple hours out isn't going to compensate for it, but again that's something to keep an eye on and adjust if needed.
Being realistic, you're probably going to need to expand that run - as it's barely large enough for 3 standard(?) birds, and a couple hours out isn't going to compensate for it, but again that's something to keep an eye on and adjust if needed.