My idea is that all together we can create at least one profitable strategy for the community... so every opinion will be tested and a reply with the results will be provided 
This is an example of pre-match strategy for over 1.5 goals FT:
Over 1.5 Total Goals (21277/24982) 85.17%
Summary
85.17% Won desired outcome
14.83% Lost desired outcome
1.19 Average odds for the outcome
So as we can see this strategy would have a great hit chance but very low odds... after 100 bets with plain stake of 1 unit per bet we would get a profit of 1 unit
If we move this to in-play and wait for the odds to be a bit higher... probably we would improve the results (or probably not as we could be missing important games with early goals)
An important detail is that in-play games can't be backtested but can be tracked for future results
This is an example of pre-match strategy for over 1.5 goals FT:
- Matches Played by Both Teams played Overall is between 5 and 60
- +1.5 Goals % by Both Teams played Overall is between 75 and 100
- Total Goals (AVG) by Both Teams played Overall is between 2 and 15
- Total Goals (AVG) by Away Team played Away is between 2 and 15
- +2.5 Goals % by Both Teams played Overall is between 50 and 100


85.17% Won desired outcome
14.83% Lost desired outcome
1.19 Average odds for the outcome
So as we can see this strategy would have a great hit chance but very low odds... after 100 bets with plain stake of 1 unit per bet we would get a profit of 1 unit
If we move this to in-play and wait for the odds to be a bit higher... probably we would improve the results (or probably not as we could be missing important games with early goals)
An important detail is that in-play games can't be backtested but can be tracked for future results