[Grammar] Position of adverbs of degree in a sentence

[Lucas [V.D.]]

Generally, we place an adverb of degree (such as 'really') right before the adjective/adverb/verb that it modifies.

Is the above rule always strictly followed or exceptions are admitted?

Of the below two sentences, would the first be always considered as categorically wrong? Or could it be considered acceptable if we consider 'really' as an adverb that modifies 'be' and not 'beneficial'?

'Having a carrier with better performance and no particular issues would really be beneficial for us.'
'Having a carrier with better performance and no particular issues would be really beneficial for us.'

 

[GoesStation]

They're both correct and natural in American English.

 

[tedmc]

They are both OK in BrE, too, though they don't have exactly the same meaning.

What is the difference in meaning?