There are some fabulous lounges at DXB, far better than the airport lounges, but you will have to ask your airline to arrange access. BA did this for me (I was on a paid F ticket, and commented that the BA lounge was a bit lacking in facilities -- they promptly arranged for me to use a private lounge in the airport, not affiliated with BA, which was 10x more lavish than the BA lounge ... no idea what this cost them, I'm sure it is not cheap, but they did not blink as I was on a paid F ticket and fly BA a fair bit). So if you are trying to carve notches into your lounge visiting belt, the gold standard is whether your airline will pay to upgrade you to the hidden lounges. The next step up is not possible by money (and I did hear the description of the next step up, rather hard to believe but it is Dubai).