I highly recommend them. They’re set in the same world as foundation but are crime novels focusing around a detective from earth and dealing with an increasing cultural differences between planets and issues of artificial intelligence and robots that pass for human. One of the things I love is how Earth is in many ways the most foreign planet to the reader.
Start with The Caves of Steel, then The Naked Sun, followed by The Robots of Dawn, and finally Robots and Empire which ties the setting into Foundation