OK - This may help you.
1. You can purchase an external mount enclousure designed for the repeaters from Icon PLC based in the UK.

https://www.icon-plc.co.uk/kirk/accessoriesinstallanddeploy.htm

2. 3WM makes a bracket kit for the base stations and repeaters, if you mount the antennas near to steel, it will affect operation, this bracket kit will solve your internal coverage issues.
https://www.3wm.ca/catalogue5.html

Hope this helps you.

Dennis
www.3wm.ca
rugged protection for wireless phones.