I installed wireless security system for my family business.
It works perfectly, no problem with range. But the shop is not that big.
One thing you can do is to place the sensor on where you want it to be, but do not fixed it on the wall with screws yet. Then turn the security on and trigger the sensor. If it starts beeping, then it works and quickly turn it off (don't want it to call the security!!).
But you have to remember to replace the battery on the IR sensor and stuff like that.
With your experience, I see no problem.
Any brand recommendations?