What are using them for? Increasing muscle mass, increasing strength in the squat/dl, or to increase strength/power for other activities (sports, etc.).
Generally I split up primary movements like those by 3-4 days.
You can squat one day and do a deadlift alteration on the same day (RDL, good morning, single leg RDL, etc.)
Then you can deadlift and do a squat alteration on the same day (split squat, leg press, RFE split squat, zercher or goblet squat, etc.)