Where Can Commercial Air Conditioning Systems Be Installed?

I'm looking for some advice on where commercial air conditioning systems can be installed. Specifically, I'm trying to understand the best locations within a commercial building for these systems to be effective and efficient. Do you have any insights on the ideal placement for commercial air conditioning systems? For instance, should they be installed on rooftops, in mechanical rooms, or somewhere else entirely? I'm also interested in knowing if there are certain factors or considerations that influence the placement, such as building layout or the type of business operating within the space. Any recommendations or experiences you’ve had with installing commercial air conditioning systems would be really helpful. Thanks in advance for your guidance!