Attempting to setup domain in squarespace and https LB

Context

1. I created a domain in squarespace.com, which has created an SSL for the domain. ex: https:www.abc.com
2. I created a regional LB in gcp (static ip: 1.2.3.4)
3. I created a cloud DNS in gcp with the A records for the ip, Cname for the domain, a records for the name server (the default in gcp matches squarespace’s name servers)
4. I am attempting to create a managed SSL for the regional LB with the domain name. Once created I am planning to setup a http target proxy for the front end.

Questions
The whole process is confusing and I am not sure if what i am doing is correct.

1. Is it okay to leave the SSL in squarespace.com?
2. Step 4. Is it okay to provide the same domain names for the LLB’s gcp managed certificates?
3. Step 4 is still pending in GCP and i am not sure if squarespace and the LB can create SSL for the same domain.