ᐅ Sealing the shower base frame to the subfloor and screed

I am currently renovating my bathroom and will soon be installing a new bathtub with a styrofoam support frame.
I have already researched waterproofing and believe it makes sense to waterproof the entire area down to the structural floor. Likewise, I think it is advisable to waterproof from the structural floor to the screed.

I have also found the following image related to this.
Is this the common method, or are there other recommendations? Are there additional suggestions for working in the screed area? For example, is it advisable to add another layer of material between the sealing tape and the screed plus insulation? Such as some kind of loose fill, or can the sealing tape be installed “loosely” like that?

Sealing up to the raw floor slab is common practice, especially with fully bonded waterproofing membranes. Transitions should be clean and free of gaps. Sealant tapes should be installed slightly tensioned in the screed; additional underlay is only necessary in very uneven areas.

I would actually suggest taking a photo of the screed first, so it’s easier to determine exactly where and how to proceed.

In general, which products do you recommend for the transition from the raw floor to the screed? I assume that something needs to be fixed or glued both to the raw floor and on top of the screed. The cut or broken edge of the screed tends to be quite uneven, right?

Attached is a photo of the screed layer. The total thickness is about 9cm (3.5 inches).
Which materials can I use to apply waterproofing from the raw floor up to the screed? Are there specific tapes for this "level"?