Are the examples (a) and (b) equally acceptable?
(1a) That cop's very short and stout
(1b) That cup's very short and stout
(2a) Her spouse's been always attention-grabbing
(2b) Her blouse's been always attention-grabbing
Are the examples (a) and (b) equally acceptable?
(1a) That cop's very short and stout
(1b) That cup's very short and stout
(2a) Her spouse's been always attention-grabbing
(2b) Her blouse's been always attention-grabbing
Your (1a) and (1b) are fine.
Your (2a) and (2b) are equally unidiomatic; always is in the wrong slot.
Try:
Her spouse's always been attention-grabbing.
Her blouse's always been attention-grabbing.
Note that there is no need to write a contraction in the two sentences above. Her spouse's always been and her spouse has always been sound virtually identical in spoken English.
In fact, you should spell out spouse has to avoid a garden path situation where the reader anticipates, for example, spouse's blouses (possessive) or spouse's lousy (is, not has) along the way.