mtu hell. please help me.

Hi all.
I have a linksys router (LR) eth connected to a mikrotik cpe (MC), wireless connected to a mikrotik access point (MA) with a eoip tunnel (ET) terminating to subscriber (SB) having pppoe server (PS) (crossing varius wlan links).
Then the MTU chain is:

LR(eth-1500)------(eth-1500)MC(wlan-1500)------(wlan-1500)AP(eoip-1500)----(eoip-1500)SB----(PS-1492)

LR is pppoe client, PS is the pppoe server.

Is the mtu chain correct or I must change eoip tunnel mtu or PS mtu to avoid pachet fragmentation ?
Is it safe to set eoip mtu=1500 and pppoe mtu,mru=1492 ?

Thanks of all.