From the ads, many of the 141 girls don't offer the overnight option. However, it doesn't hurt to ask. On top of that, don't you want to sample them to see if you are compatible before commiting yourself to the overnighter?
And not being able to speak Mandarin and Cantonese can be a huge road block to you. As most of the girls don't speak English. On the other hand, many of the girls do speak Mandarin. So you are better off there than me
But the papasans seem to be fluent in English.
Hope you will have a grand time in HK