Yes, it is possible to manipulate multiple models in a studio experience; I've done it many times. Studio doesn't yet support tracking against multiple models in the same view (multiple model targets) but you can put multiple models in any view and manipulate them.
What is the use case you are trying to accomplish?
You'll need to design the way the user will select which model to control, a way to show them which model is "active", and design the controls that the user will use to manipulate the model (move, rotate).
I'm assuming you just want the user to move the model in the XZ plane and that the location in the Y axis will be fixed (that's what is happening in the ikea app). The fewer DOF you need to control, the easier it is for the user.
There can be a problem with AR experience like this if you expect a high degree of precision. The types of controls typically used for positioning (like shown in the ikea app) make it hard for the user to place a model precisely. In the furniture example, it's probably not an issue if the ottoman is a few inches to the left or right.
Thank you for reply.
Yes, there will be a list to pick desired equipment for placing.
Ideal controls of moving and rotating would be multi-touch-gestures.
First is to move on the floor freely, 2 DOF, both in X & Z directions. It would be better if 3 DOF is available with well designed control.
IKEA place has 2 DOF, not so obvious in the YouTube video though.
Give it a try would bring better understanding.
Few inches of lost in precision is not an issue.
Moving in the XZ plane using 2 fingers is fairly easy, rotating around the Y axis using 1 finger is fairly easy using the functions I listed above. When you want to add an extra DOF (like moving just in the X or just in the Z, or moving just in the Y, or rotating around a different axis, etc) the user interface requirements and/or the control mechanisms are more difficult. When you add the additional DOFs, you either need to provide a UI for the user to select the axis/plane they want to move on and the axis about which to rotate or you have to implement gimbal style controls.
As you do compound rotations, the math becomes much harder to implement.