Yes; in series for approximately a 16 ohm load (unless a better choice comes along)... quality amps should allow this.
I hesitate to put them in parallel (giving a possible load of less than 4 ohms at some frequencies) as the power supply in the Denon X3800h seems a bit on the anemic side... Though admittedly it has a lot to power with most outputs driven.
It's why I put an higher power amp on the front L & R; to drive the power hungry R700s.
In recent years, after the brand left Japan, some Denon products seem to have become, slightly, pale imitations of what they once were, IMO. Now it looks like Marantz is staging a bit of a comeback.
(I took about a 20 year time out from home audio to concentrate on building Difficult Terrain 4WDs (four wheel drive vehicles))...And Camping in hard to access places.
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Enjoy!