The 'original topic' wasn't about floor-spots, it was about sing-arounds and the ratio of songs per rotation allocated to solo-performers v. duos/groups.

The majority (maybe all) of the clubs I attend which have performers doing floor-spots give two songs to each floor-spot performer. Some give each performer a spot in each half - therefore four songs total, some just one spot for the night - thus two songs.

In sing-arounds in my area (Lincs, South Yorks, Notts), it does tend to be one song per rotation for solo performers, two for duos/trios etc.