Short answer: Yes there are advantages, but not always.
However, I will never tire of saying that there is rarely a black and white view, and this is a case in point.
Take the simplistic case: You have a square building with one square inner void and a flat roof of a known height. You assume that cameras are fixed as high as possible towards the ceiling so maybe you don't even need to specify a height.
Now take a complex situation (not necessarily worst case scenario, but getting there). You have an awkwardly shaped building with multiple floors; lots of inner voids, some with domed ceilings; apex voids; gable ends; internal beams; stair wells, etc etc. A 2D plan view makes it really hard to strategically position cameras and be confident the locations are correct or even sensible.
The second case is one where a 3D view could really help, both from the perspective of the viewer, and a first person view from the security camera.
And then there's all the possible scenarios in between, some of which a 3D view doesn't add value (or even makes it more difficult); others where 3D view definitely adds value; and some where the use of 2D or 3D view may or may not be obviously beneficial.
The obvious question is: of your current and potential users, roughly how many fall into the '3D helps' box and how many don't. And of those that do - do you want to support them, and if so at what cost to the business. And once you start talking about business logic and ROI and new target markets, etc, then that's all research only you and your company can do.
The outcome of all this is that it is a short step to the ubiquitous answer of: 'it depends'.
I feel I'm stating the obvious here - without providing a real answer. But sometimes the obvious still needs to be stated.
Since we don't know about your particular types of users and their needs, and the knowledge you've built from customers past and present, then it seems unlikely that we can answer here the question better than you can.