Hi @ArohaRae,
Thank you for your question and welcome to the Bunnings Workshop community, it is great to have you with us.
Would it be possible to upload some images of the surface you are preparing? Let me know if you require some assistance with this, I am more than happy to help.
If the self-adhesive tiles are similar to these Vinyl Tiles - Peel And Stick Tiles then they indeed work well assuming the area is well prepared and free from any dust or loose material.
Let me know how you go with those photos.
Jacob
