Yes, the GPS trackers (like Tile) are great for items you can attach them to, like keys. iPhones have the “Find My Phone” feature to help you track a lost cellphone.
Many people with ADHD also establish a “launch pad” in their homes. It’s a spot by the door where you enter and exit, where you put everything — keys, phone, glasses, wallet, purse, briefcase, etc. Once a habit is created to use it, it will reduce losing things at home.
There are more strategies in these articles too:
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism