HAProxy and Mysql Cluster Topology -

HAProxy and Mysql Cluster Topology -

i've installed mysql cluster 2 info node,2 sqlnode , 1 management server on different hosts.in add-on i've 3 different app instances.

now want install haproxy in front end of mysql cluster not sure topology.i searched on google confused lot more since of examples utilize additional components galera cluster etc. should install haproxy on different host or haproxy must on same host app instaces or sqlnodes?i read each 1 has pros , cons latency introduced wonder 1 more accepted , used ?or reference or tutorial on this? (apps written in php running on centos 6 32bit way)

mysql haproxy mysql-cluster