Technically they aren't actually digital amps but use an analog class D scheme.
Here's an interesting article by Hypex designer Bruno Putzeys titled "All Amplifiers Are Analogue But Some Amplifiers Are More Analogue Than Others" Currently I'm using a receiver very similar to yours, a Panasonic XR-55. Very nice sounding for the price,
it's treated me well.
Not sure yet what I'll do upstream. I really like the Mytek converters, but a Mytek multi-channel setup gets pricey. Considering looking a used Lexicon MC series surround controller. I'll be using some form of computer source playback so I'll probably need a soundcard > multi-channel DAC setup. I don't think there are any networkable media devices that support unencoded multi-channel. Most are stereo + digital pass through of DTS/Dolby encoded surround at best.
I do plan on designing the bases to allow some tilt with threaded studs to the exiting mounting points on the speakers.