will these are the places where you have to clean in engine pay to make sure of proper grounding and positive in the pictures all you have is to make sure that they are cleen
Also you can go for Big3 upgrade which includes upgrading 3 places from factory wire to 0 wire which is very thick

Placess are:
alternator positive to battery
batt negtive to engine block
batt negitive to chasis

of course with a car that battery is in the trunk the big three is harder

so i think you will be fine just with cleaning

leave you with PIC look for red circules and forgive my poor english

in that pic there are 2 grounding bolts behinde the battery