To be honest i might be lucky here. We use an easy to swivel and remove mount for our iPads and do not have to to write down any clearance or ATIS we get via datalink as that is centrally archived anyway. Therefore it is usually performance stuff and a quick fuel/time check every hour. Especially for the performance stuff i usually have the EFB on the table, and the rest either in the mount or on the table, depending how i feel.
Yes, there are rules for workplace ergonomics and IT equipment, but those usually have caveats for workplaces that simply do not allow for a traditional desk type installation, like flight decks for example. Of course it is even better if the EFB is well integrated like in the A380/A350, but that is only possible with new designs and enough space, so will be hard to do in narrow body flight decks.
But i do think Airlines should take IT ergonomics into account, which means standardized mounts, easy to use software and removing the need to double or triple entering the same data into different systems. Better IT can actually help with that, but sadly many flight ops types are neither IT specialists nor do they fly often enough to notice such inconsistencies.