Safe to use Wheel Adapters 5 on 4" to 4.5"?

Thanks so If I did The 1ā€ Adaptors I will now need different backspacing on the rims right? I want to make sure I get the right rim size. Iā€™m doing 17ā€ rims in the front with 15ā€ in the back.
JEGS 681290: SSR Star Wheel 17 x 4.5 | JEGS