No, they are usually fitted once and left.
If you need to remove them then you need to drill new holes.
Or you should consider fitting a wooden framework to the concrete and attaching to that so it can be easily removed and refitted, without disturbing the concrete fixings.
You could have a 8mm hole drilled and reamed slightly undersize for a press fit 8mm dowel pin and use a 8mm/8mm swivel clamp which would let you set the angle and height as desired (photo from McMaster).
First of all, I'd like to point out that you are mixing (not without reason) the concept of proof load which is intended for bolts and the concept of proof stress and yield stress that is intended for materials.
Yield stress vs proof stress (and others)
Typically, the stress needed to produce 0.2% of plastic deformation is considered proof stress (sometimes ...
Figure 1. Clamping point.
On the webpage you linked it appears that they hold the device on the 8 mm diameter rod sticking out the bottom. (Look at the press-mounted device.)
To mount on an aluminium plate and have the back of the instrument in contact with the plate you just need a block of aluminium, steel, plastic, etc., and drill an 8 mm hole 11 mm from ...
Proof load is the maximum load the bolt can carry without exceeding deformation criteria.
Below are quotes from two sources:
Proof load is an amount of force that a fastener must be able to withstand without permanently deforming.
Proof load is defined as the maximum tensile force that can be applied to a bolt that will not result in plastic deformation. A ...