How can you terminate custom/external HTTPS SSL certificate in AWS ELB and EC2

How can you terminate custom/external HTTPS SSL certificate in AWS ELB & EC2?
    1) at ELB level
        use AWS certificate manager, create a certificate & upload your existing certificate
        In ELB Listener rules, configure HTTPS(443 port) & attach the above certificate
        Limitation: You can add only one certificate per an ELB
    2) at EC2 level
        Suppose if you have multiple sites under EC2 (multi-tenant) & want to terminate HTTPS certificates for all the sites
        Having an ELB for each site will be costly solution, then you need to use TCP pass through solution
            https://test1.com
            https://test2.com
            https://test2.com
        In ELB Listener rules, configure TCP (443 port) pass through
        You could not obtain the clients IP address if the ELB was configured for TCP load balancing, so enable proxy protocol
        Enable proxy protocol in ELB through CLI (not available in AWS console), which allows X-Forwarded-For headers  
        Then the termination happens at you EC2 server level (Nginx/Apache)
       
        Nginx:
            server {
              listen *:443 ssl proxy_protocol;
              server_name *.site.com;
              set_real_ip_from 0.0.0.0/0;
              real_ip_header proxy_protocol;

              ssl on;
              ssl_certificate /opt/site/conf/ssl_keys/nginx_site.crt;
              ssl_certificate_key /opt/site/conf/ssl_keys/site.pem;

              location / {
                proxy_pass            http://127.0.0.1:80;
                proxy_read_timeout    90;
                proxy_connect_timeout 90;
                proxy_redirect        off;

                proxy_set_header      X-Real-IP $proxy_protocol_addr;
                proxy_set_header      X-Forwarded-For $proxy_protocol_addr;
                proxy_set_header      X-Forwarded-Proto https;
                proxy_set_header      X-Forwarded-Port 443;
                proxy_set_header      Host $host;
                proxy_set_header      X-Custom-Header nginx;
              }
            }