stern ramp.
With phased array illuminators, I'd be a lot less concerned about number. Two might be fine. It's not like you have a ton of VLS, and those units aren't going to be cheap.
Well. They're APAR derived units, so you're looking at 2 or 3 enlarged APAR faces. APAR can do AFAIK 8-16 terminal intercepts and 32 course corrections simultaneously. Whether that's per face or in its entirety I don't know.
If I could get away with two without degrading my capability I'd be happy.
Just one little question, you removed the well dock? so there is no capacity to (un-)load those LCVP's would it be a idea to replace them by CB-90's for protection of the ship and landing crafts in case of amphibious raid. Maybe other boats are an option to like the Italian Cavour carrier / LPH. Most of your forces will be transported by your helicopters and supporting LPD's.
I had thought about CB90s, they are after-all in operation with the navy so it might make sense to. That said, the LCVPs can be loaded in the same way as Ocean from the stern ramp. (Also note, I've gotta put the proper helos on there still)
ETA: LPH updated.