The 13 slot H110 board is a good mining board but running that many GPUs on a system just means that one failure point takes out all of your hash power. I personally recommend 6 card rigs.
For a good 6 card rig my current favorite is the Asrock B250 Gaming K4. I run hundreds of these and they work great. I also have had very good luck with the Asus H270-A but that is a more expensive board than the others so I wouldnt recommend it over the Asrocks.
I also agree, running 13 card rig might cause you problems when troubleshooting and down time.
I too only run 6 card rigs in my small facility. Where im located, the biostar tb250 pro btc boards is cheap for me. Also been very easy to set up and never caused me any issues.