How do I solve the Riddler Challenges where the question marks are behind chain link fences?

There are a few Riddler challenges that involve hitting a question mark with your batarang while you're standing on a pressure plate (the question mark is unlit until you step on it).

The problem is, there are a few that block off access to the question mark with a chain link fence once the pressure plate is activated.

I've tried throwing a remote control batarang away, and then aiming it at the question mark and letting it fly on it's own, and then stepping on the pressure plate when it passes the fence, but most of these challenges involve more than one question mark.

How do I solve these types of challenges?

As I recall you can also use explosive gel to trip the switches once they are active. Gel up all the switches then go over and step on the activating switch. Once they are active, detonate the gel and all the switches should go on.

If there are more than 3 switches, you are usually in the position to gel the out of reach ones first, then quick-throw a batarang at the one closest to the pressure plate.