Im sure that CE on the pic might stand for China Export 
Since I have been working in an EMC and Safety testlab I can shred some light:
1)As long as your experimenting it doesnt matter in practise how ur setup looks like concerning safety and EMC
2)When You start commercialising you generally must have CE (there are some exceptions). Fines can be quite high.
Mostly the procedure against a non compliant start when theres a competitor who already got CE for their products OR when you create so much disturbance half of london TV screens starts to generate white snow OR when there is a serious injury related to the product and testing according safety requirements is not proven.
3)CE certifications costs thousands of euros
4)If you really insist on commercialising your IoT hardware here are some tips to keep costs low:
- Use the RN2483 module, it is pre cerified and shortly explains in the datasheet what is left to do to make ur product compliant. Ofcourse other modules will do to but prices will be higher for additional testing
-When asking offers of testlabs you will note each testlabs has some small differences in standards that needs to be tested, this is mainly due to the complexity of all the standards being around.
-Each product is different but generally lora sensors will be tested according the following standards::
EN 301 489-1 see http://www.etsi.org/deliver/etsi_en/301400_301499/30148901/01.09.02_60/en_30148901v010902p.pdf
and EN 60950 safety requirements
In the lora case most sensors will pass for EMC first time
For EN 60950 this is not the case. Generally speaking only 2% passes first time. So 98% who have not read the standard will need to adjust the design and retest for safety
If your developping a product you can always pm me for some advice (as long as its a product not competing with mine, in that case expect a recertification request soon )
Cheers