Should all be from outside , there could be a bolt inside the boot area not sure but rear shocks are allways easy . Just unbolt the lower mount with the car on stands let the arm swing down then undo the upper.
If its like the alfa's which it prob is then be carefull with the upper bolt as its prob behind a rubber bung inside the rear arch and when undoing they tend to drop down into the abyss forever being a rattle so something sticky in the socket should help.