Ceramic coatings (my opinion only, but from seeing them and knowing people who have used them) are in essence the ultimate paint sealer. IF, that is, you get a good product (more about that later).
It all depends on what you want to get out of them, though.
If you are looking for protection from stone chips, etc, you need Paint Protection Film. Nothing less will help that.
If you want to get a low-maintenance finish on your car (essentially hose off and drive-dry) for most regular dust and dirt, but not real road grime, then consider a nano-coating.
If you are concerned about how easy your car's finish is damaged (swirls, marrs, holographing, spiderwebbing, etc) from even very carefully handling, then ceramic may be for you. Especially if you are OCD about this. And especially if you have red or black paint which seem to show these marks more readily.
IF your car has soft paint (Honda paints seem to be a bit this way, but there are lots of high-end cars with worse), this will provide a harder top "clear coat" that will survive abuse.
NOTE that you need to have PERFECT PAINTWORK to apply ceramic overtop of. Any blemishes will, essentially, be preserved in amber. The biggest cost for professional application is in paint correction ahead of time. The older the car, and the more abuse it has seen, the more work needs to be done to get the car coating-ready.
Problem is, like everything else in life you get what you pay for. MOST of the stuff advertised as ceramic nano-coating is liquid shyte IMO. And that's where this gets its bad rep.
The few exceptions that I am aware of are Opti-Coat, Modesta, and CQuartz Finest. Those are the real deal, will last you 3-5 years with minimal maintenance, BUT will cost you thousands of dollars to have applied. You cannot buy these for DIY application.
The next best thing is to go onto Amazon and get CQuartz UK directly from CarPro, and while you are at it, a bottle of Reload (required for CQ-UK).
I've done the CQUK thing on wheels (face and barrel). It's not that hard to apply and results are very good if you follow directions to the letter (watch a few videos as well). But get that paint perfect first, or you'll regret it.
And finally, with a car as small as the CR-Z, it really isn't a big deal to wash and wax it regularly, maybe apply a sealer a few times a year also. Does not take very long, is hugely rewarding, and incredibly cheap.