You need line of sight with the Denon remote controller. Sony never released an official remote controller app for their blu-ray players when they are connected to a network.
If the projector supports HDMI-CEC, you could turn it ON in the projector, Denon and Sony player. Then, with the Denon connected to your network, you could control the receiver and player using the Denon AVR Remote app from a Smart device in combination with HDMI-CEC. Results will vary of course.
View attachment 63566
View attachment 63567
View attachment 63568