Yes

Yes

I’m using two Roku speakers on my stands and have not found them to be wobbly at all. The base is a nice size. They stand up really well. The only thing I found is that you need to make sure you have a wrench handy to tighten screws if they go into the back of your speakers.

I don't know about the Bose speakers, the stands come with a bunch of mounting options. As far as wobbly these stands the pictures don't do them justice. These stands are very sturdy, the base is heavy much heavier than small rear speakers and base also comes with carpet spikes if you choose to use. I used the spikes it keeps the stands from sliding on carpet. The pictures make the stands look like not worth the money but I went ahead and purchased glad I did the stands are very sturdy. Only tough part is feeding the speaker wire through the tubes, the wires thread up through the tubes so you don't have wire hanging lose. I used a rigid feed wire then pulled the speaker wire through. These are good stands.