How are the neighbors planning the development? If they build more with the slope, it will be expensive for you, really expensive. Building on the plot like that is not cheap anyway.
What does the development plan say? Are you even allowed to do that?
I would push the house further back so that you get a nice front garden. Below, living UG with garden. Above, living rooms with garden. Rear wall UG is better for you, the EG catches the slope.
Have you planned with an independent architect or GU?
To answer your initial question, yes, we have a slope, no, we do not have a traditional basement.