Yes, you can connect all devices projector and Swisscom box Dvd no matter what with HDMI. You can also connect several Denen Home speakers. However, these will certainly not work with Dolby, you need physically connected speakers
As far as I know, you can connect anything via HDMI. I'm not familiar with the Denon 150 Home, but I connect my sources via AirPlay and Bluetooth without any problems. As mentioned by another author, there may be limitations.