racket-mode is good in that it at least indents Racket code properly. It implements it's own integration with the REPL, IIRC, which makes working with Geiser at the same time not ideal. But still manageable, just a bit of tweaking needed. Disclaimer: I may remember wrong or it may have changed since I was last configuring Racket support in Emacs, so don't get discouraged and just go check racket-mode anyway :)