Yeah, I've got a couple of 21st Century's 1/18 airplanes. They were pretty nice, actually. Some modelers did some superdetailing on them, to hide the seams between parts, or weather them. I thought that when they were still in production, they presented a good opportunity to get a kid interested in the hobby. Because they were relatively cheap, you could buy one, give it to your kid, and let him play with it. If he breaks it, it's not that big a deal. That's what creates the best memories and the interest that might lead to building other models.
Anyway, to displaying them, yes, hanging them is probably the best way, unless you have a large enough flat area to display the aircraft parked. Strong anchors are a must, given the weight of the model. I've used anchor bolts inserted into the ceiling drywall, and also, small screw hooks, screwed into overhead ceiling joists. Strong fishing line works to suspend the model from the hook.
Hope that helps!
Best regards,
Brad