Shipping real people is rarely a good idea, well I suppose a mild interest is OK, but anything beyond that is a bit odd TBH.
That said the format of Strictly does encourage the romance angle of the partnerships and even if they don't start the tabloid rumours themselves they certainly give them a little nudge now and then. The show is a bit hypocritical like that.
I have no idea what Laura and Giovanni think of each other. However if I were advising him I'd say it was a good idea to not romance his dance partner this year lest he gets labeled the male Kristina. Not that I think Kristina deserved the flak, but still it's something that Giovanni could do without.
So, sad as it may be for the goolau shippers, I think that Giovanni and Laura may remain platonic. ...in public at least.