Or you could just use your camera to take pictures of everything.

We are talking about rental properties, not government surveillance of your smart phone or some other privacy intrusion.

Maybe get a wireless camera of some kind outside in the front.

Since the old times, even before cellphone camera/video capability, I have been taking digital pics and providing a record to our Clients at takeover and every interim inspection, as well as when special, or unique projects come up...plumbing or otherwise.My practice has always been to systematically walk the property, so the pics generally tell an understandable story.

. — I plan to install a ring camera over the area but does anyone have a gate lock style or brand that they recommend to really secure the property?

Put cameras up in the place so you can record what people are saying as they tour the place. 

I'm about to become a first-time landlord and want to have exterior security cameras at my unit that upload to the cloud.

I think I can purchase about 5-6 cameras to monitor the entire property so it’s not a major operation.

I would have someone help you furnish/design (unless you are good at that)  and get professional pics - also get ring door/security cameras - smart lock - nest theromstat - Find a way to make your property unique or stand out somehow.

Has anyone in the Boston area installed security cameras at their property?