I recently had a similar situation, and narrowing my search to a single district really helped. When searching for penthouses for sale in Dubai, it's important to know that the price per square foot can vary by 30 percent just by crossing the border of a single district. Listings are grouped by zone without prior notice. For example, options by zone without mixing time frames are listed here
https://atvir.com/uae/residential-complexes/penthouses