I find it hard 'seeing' a tag team that is formed by two singles guys. Like you know they're not a real tag team, they are just literally 'two singles guys thrown together to fill in the void spot'.
That said, London & Kendrick had it done perfectly. For it to work, I think both men should be reasonably similar, looks, style etc, and definitely need to have the same costumes, or at least the same colour patterns.