Preheat broiler. Using kitchen scissors, cut a 2-in.-wide rectangle from the top shell of each lobster tail; loosen from lobster meat and remove., Pull away edges of remaining shell to release lobster meat from sides; pry meat loose from bottom shell, keeping tail end attached. Place in a foil-lined 15x10x1-in. pan. Arrange butter slices over lobster meat., Broil 5-6 in. from heat until meat is opaque, 5-8 minutes. Season with salt and pepper to taste; serve with lemon wedges.