Re: Dubai visit visa ??
Yes, you can apply from anywhere. You will receive a letter (PDF file) that will have your visa confirmation. When you will reach Dubai, just give your passport and the letter to the immigration officer and he will put a stamp in your passport. There will be no visa sticker, a stamp with some number will be put in the page, along with Entry stamp which is usual.
For complete up to date information, contact Emirates offices and tell them your situation. That you plan to visit along with your wife on xyz date and will apply for UAE visa using their services.