Well welcome to the forums. That is a pretty day sailor there! Looks like you have two options either bulkhead, or a swing out companionway mount. Either will give a good view, the swing arm of course will give a view from down below. I would say sail it for a season or so before making any real modifications, though. So if you feel you really need it, then a swing mount would be the most reversible if you feel it does not suit your needs located there, a bulkhead mount will require holes drilled, and that makes it hard to undo. Where will you be sailing? Will you really need a chartplotter? Likely the first season will be spent getting to know the boat, and just local so you may not need one right away. Given that you may not "need" one a lot of the time you may want to look into a waterproof case for a tablet, With good navigation software they can be very useful. Either Android, Window or Apple will work, though Apple will give you the most choices of truly waterproof cases. All three platforms work well, as will Linux but they are harder to set up on a tablet and that leaves you with a laptop for that option. My suggestion is windows/Linux with Open CPN as a good starting point.