turnable previews and videos (avi. mpeg. mov. etc)

you can do here and put the link in your model image in ( + ) :

https://sketchfab.com

Oh, I forgot, also the youtube link works in image (+) !!!!!!!!

I Love the Marmoset Viewer. It's included in Marmoset 2.0. You have a button which also previews all used maps. And of course speedy 360 degree turnarounds.

Sending the customer to another page in order to see your turnable does not seem practical to me.
In my opinion it would be faster and more conveniently for the customer to have images and turnables in 1 page.

I agree with Ioannis.
Customers like see turnables because they permit to see the model in all the angulations.
I usually create two turnables for my model: one with materials and textures and one in wireframe. I use Youtube for posting this video in my web site.
Where it is possible to publishing the turnables as additional preview image, I do it (for example on TurboSquid).

There isn't need a lot of images for a good turnable. 72 images are enough. The turnable shall be a bit slow in order to be useful.