The receiver enclosure is DIN rail mountable. Hence simply snap the receiver on to the rail to fix it. For plain wall mount, fix a 270 mm piece of DIN rail at the wall with at least two screws and lock the receiver on this.
When planning the mechanical installation of the receiver, please consider that the connectors are placed at the front sides of the enclosure. Depending on the flexibility of the cables you are going to use, you will require about 10 centimetres space for cabling on both sides of the receiver.