I'm thinking of putting it on the bottom of the wire mesh at the top of the T due to the fact I'm going to be working in trees with low branches. I might just use zip ties to put it on that way I can take it on and off easily and put on the loader frame when I'm not using the shear. Otherwise I might just get the wireless ones but I don't spend like spending another $100, it's $274 for the monitor and two cameras wired and then $384 for the same but wireless. Also the camera on the loader, when I am square baling I will take it and put it by the knotters to see what's going on there.
Consider using 3M Dual Lock, far more secure than hook and loop, will hold cam rigidly but allow easy removal.
As Zebrafive says, wireless only applies to the data, you still have to power the cam with wired 12 volts - - most all of them don't run on internal batteries and you wouldn't want that anyway, batteries wouldn't last very long. The wireless systems have another disadvantage in that they suffer from the vagaries of radio, subject to RFI (radio frequency interference) etc. Not unheard of to have picture interference and drop outs.
You'll want to get the camera and monitor temporarily hooked up, takes just minutes, then figure out were you are going to mount things. With the Rear View Safety system I mentioned earlier, everything wires back to a "multiplex box" that can be hidden away behind the dash or wherever. Power is only required to this box. Everything else just plugs into the multiplex box - plug and play. Some other systems have all wiring going to the monitor (not usually so convenient to wire) as with the RVS, only one wire need go to the monitor.
Note that the plugs on the RVS system are 5/8" diameter and the cords provided are generous in length - this can also present a problem in some cases. It may be more convenient to cut the wire so that you have only to route a 3/16" wire, this also allows removal of any excess wire. Splicing the cable back together is easy (soldering required). There's 5 wires and 6 if you count the shield on the yellow video wire which needs to be connected too. (If you don't want to use the remote microphone function, you can skip those two wires.)
The location of your forward cam will, to a degree, be dictated by the field of view. Typical back up cams have a fairly wide field of view, 140 degrees or so. This allows the camera to be mounted close and still cover a good area. On my front loader, I can see the entire cutting edge with the camera mount as shown in my previous post.
