Where I am a manufacture and I think your question is geared towards other users... it would be helpful if you clarified what you're trying to do with a MAM. Are you looking for both online & offline searching of assets? What type of metadata requirements (if any do you have)? Do you need to have proxy previews? Is this internal for your team only or are you trying to have client based access? Does it matter if users can connect from outside the office? Do you care about any editing/timecode notation functions? Can you describe the storage system(s) that this will be managing? Is there any LTO or Cloud backup/archive integration required?
Sorry for the list of questions, but I think it will help get some info going defining what you're trying to set up.