Very neat. You may not have to use screws, Blu Tack or Black Tack might be sufficient, if it doesn't work then 1 screw would surely be enough as they are not heavy speakers.Thanks, this is really what I am afraid of: the rounded contours !
An other suggestion is :
But then: I have to screw this into to the bottom !
Excuse my English, I'm from Holland
what did you pick in the end?