I assume you understand that you are actually disabling TLSv1.0 with this configuration, not SSLv3.
This 2 options disable TLSv1.0 on SSL connections from haproxy to the backend server (if any). It has nothing todo with the SSL session between the browser and haproxy however.
No, it isn’t, you need dedicated bind statements.
If all you have is a single IP address and port and you absolutely need this: use a TCP frontend without SSL termination, SNI route to different backends that recirculate to traffic to dedicated SSL frontends with different configurations: