Would just like thoughts. WE have decided not to use a hyphen for [name_m]John[/name_m] [name_m]Luke[/name_m]… but I am wondering on thoughts about two middle names for boys. Is it a yes or just a hassle???
I like [name_m]John[/name_m] [name_m]Luke[/name_m] without a middle name. 
I’m always in favour of 2 middles, but if his surname is multisyllabic, [name_m]John[/name_m] [name_m]Luke[/name_m] could work fine on its own. If the surname is only one syllable, maybe a non one syllable second middle would create a slightly better flow.
In general with boys name I don’t think 2 middles is any more of a hassle than one, or than with girls names.