Carv is designed to function in a fully enclosed alpine ski boot, with the insert fitting between the shell and the liner. We therefore do not guarantee compatibility with Apex or Dahu boots, however we have had multiple accounts of customers successfully installing and using Carv with this type of equipment.
For Apex boots, you should be able to fit the Carv insert between the liner and the walking boot.
For Dahu boots, which do not have a liner, the insert can be positioned in between the "walking" boot and the outer exoskeleton.
With both models, you will need to ensure there is somewhere on your boot for the Carv tracker to attach. This will depend on the specific model of boot that you are using. Some users have attached it to their top buckles or the tongue loops.
With Dahu boots due to the repetitive insertions and removals of the boot into the shell, you may find you get increased wear of the Carv insert. Although this shouldn't affect the functionality of Carv, we suggest that you apply additional adhesive tape (provided in the box) when securing the insert and take care when stepping into the Dahu shell.