Oh, and there is one other alternative. You could put smart bulbs in three of the locations and the smart switch in the fourth location and then group those together. That way turning on the switch would turn on the lights in all four places.
It’s very important to know, however, that smart bulbs are intended to always have power available to them. If you start just flipping A regular switch on and off and it cuts the current to the bulb, they will work just like a regular bulb and turn on when the switch turns on, but the high inrush current each time the switch is turned on can damage the radio inside the bulb over time, significantly shortening the life of what is already an expensive bulb.
It’s OK if there’s just an occasional power outage, but you don’t want smart bulbs to have the power cut to them regularly.
So again, this is an option that will work for some households and not for others, particularly if you want to always treat all the outside lights as a group.
This is an option that some renters will choose, for example, because it could be done without any wiring. You actually don’t even need a GE Type wired switch, you could just use the battery-operated switches since the bulbs will have their own power. The trick then it is to keep people from using the old wall switches to cut power. There are a lot of ways to handle that, including just putting a childproofing lock on the old switch.
So that’s a no wiring possibility for grouping lights as well. Didn’t sound like something that would be of interest to you since you have already ordered one wired Light, but I did just want to mention it.
Here’s the FAQ for switches that work with smart bulbs: