How to create site-to-many-site IPsec-VPN between several hEX?
are you referring to hub and spoke VPN topology?
Please be more specific. Explain with details what do you want?
vpn_network_scheme.jpg
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hEX will be fine, just take in mind the max throughput of hEX using ipsec will be 20 to 30mbit/s
maybe to ease the routing between branch offices iPiP over iPsec will be better
This is the guide how to set up site-to-site IpSec VPN - http://wiki.mikrotik.com/wiki/Manual:IP/IPsec#Site_to_Site_IpSec_Tunnel.
But there are no guides on how to set up site-to-many-site IpSec VPN.