Most small studios aren’t blessed with a grand piano, but an upright is more likely to be available. The trouble is, it can be a lot more difficult to get a great sound from an upright piano. Here are a few miking techniques.
Although there are numerous ways to mike an upright piano, none of them are particularly ideal. Technique #1: Place an ORTF or X/Y stereo pair about 3 feet away from the back soundboard. This method will provide a nice wide stereo field, but will be lacking in high end and note definition.
Read more about this here: https://bobbyowsinskiblog.com/2019/04/10/upright-piano-miking/