Based on what I can gather, I think we are being asked if the device that was linked to is a good idea or not. I think the device enables "wireless" airplay/hdmi mirroring, similar to wireless bluetooth headphones. You have a receiver and a transmitter.
If only to watch Iphone video on TV, it means nothing to me. It works as a projector, how well can it replace the projector? If play music, that woorks. the connector can plug on any amplifier.
If I understand the question correctly, there are cables that output from an iOS device to various video output types. You just need to match the projector video input.